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Singapore grants ESCOM patent for filtering technology

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ESCOM Corp., Oakton, Va., last Thursday said it has received its first international patent for its spam filtering technology from the Singapore Registry of Patents. ESCOM, a 16-year-old Internet technology company, has other U.S. and international patents pending. The Singapore patent is centered on three filters that detect junk e-mail: a client filter that detects client computers pretending to be e-mail servers, an address verification filter that detects nonexistent (forged) sender addresses and a relay filter that detects open relays. ESCOM's customers include ISPs, state and federal governments, educational institutions, and manufacturing and technology companies.

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